too- either

We use too and either at the end of a sentence.

We use too after a positive verb: We use either after a negative verb:
• A: I‘m happy. • A: I‘m not happy.
B: I’m happy too. B: I‘m not happy either, (not ‘I‘m not… too’)
• A: I enjoyed the film. • A: I can’t cook.
B: I enjoyed it too. B: I can‘t either, (not ‘I can’t too’)
• Mary is a doctor. Her husband is a doctor too. • Bill doesn’t watch TV. He doesn‘t read newspapers either.